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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752bc2266a8f7782f81cbc498471bca40167959939de1c3a83c00694a1306824' 
  AND token = 'Wzfsw8AtokVSh0d4wWLKQc9jI7qYKYL9RtDWgH5KLVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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