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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8edaa22905140db822331999dd6ad791597b0e356959ce979f0e543d4215c92f' 
  AND token = 'comf7qdrDSGxVESu2S8sbLGR8KaKELJ0PTcovGlbi88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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