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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7172ae2a7028d14b4f21a07a80aedb15a0718c35d645a7cf826ad75e061a77c7' 
  AND token = 'Ec19CUz2IfuL0ojXV4wEBSVBxPswPcsqOTtmvgA0PVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}