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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9fc945333926c0fe04aa1d924e3a029d6c99a6b0b571173284556d435b5fae' 
  AND token = 'KPcHptCEbucoN5AgnW6ORFq49m59cLQtEdtVP9Wu1ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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