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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb8d604a9a5d1d7893070209bc40d8f39e1a162671e1841a86ce3534a846ab0' 
  AND token = 'y+ypDPxzoScT8Yet0cxstq6+Qc0u+162vDjb9hgzr4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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