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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916db7e3085e577ef4deaab5bde4367ba484e45f98c6a301fc6db0dd3f45fd4d' 
  AND token = 'dWc+UEyYR4b4N4bHOP0gO0Q15PuDoBUfLJeX2B4Jess=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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