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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e49afe0f17598cd502c41660638fd4d993046e468544f5cd230472cbb3d69547' 
  AND token = 'PE+bQHkWc4Ih2lqld17DMFc22P0FEnuzuQ5piPLiR1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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