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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566e0c31769ef5d62f2b85112b33332c6fee8987b28939df8da6a029870a9de7' 
  AND token = 'AMcm69U8+s1Jjh+cQuqIp/x/OaT3CYy4n3t6/JBcNNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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