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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f819d5fe24ad9fb746bc55a2d121a0f5f6ab867de234d6aec364caba1e9d450d' 
  AND token = 'vOXZ/81+JybO6eVXtuANLSYvHSOdINFqPYOQGv1I3SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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