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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fac71274c1c91e719e84696a5aab8f76390c5ab177f6edb31662c7c1413bd74' 
  AND token = 'KqroA6El22Go8SEjPAhVonfj1qcnU4Fq083Sxe49QGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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