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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf8eda2cf4abb48af3c9dc8392d57c7cee2fa941d455bfa229f25ca41d3d87e' 
  AND token = 'ihugNAvZD1PHUE0j1SrVU8i3frWnH/sYFOERPlppsFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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