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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e04fcb008b159b48390d95df3030cb81fa3a735d31247de3021acdc1b16d4d' 
  AND token = 'svkqRj3iZLJnwMpf3MIKKBMutZNBojIkcJPZQEhHFk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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