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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eadfc2248945065a9ce1fe4599adc521e0ed9bc0eba73f86e14399261aefde2e' 
  AND token = 'SP+AR8acOGAInRXtQbNULNdRVxgMTWTffBz/HvYU3lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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