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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191553b0a38b6bb4841a8aad9073d266f671ce6f4bb37ee5351a96bf5feffeab' 
  AND token = 'gAH1uwSN9GicBRi5m494FjSHGT2meEwdkAEUsZ/9h44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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