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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd039e47e0b65a7321a33c531c7612cca94701c3407a071791ee51d0e94f88a' 
  AND token = 'JyZe6MoD7qzOSIFhwJ9g87wnVT2RDMpGc4pRJrzOOwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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