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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf76b0b0e4d9c746fd6df54b2ea156403c082363c78ec5fcf119a766b7245e2' 
  AND token = 'P3ChfALD7mLbeGQlJhMyRtHDDK5mmLSmCpk480jOax4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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