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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55304bdf0dac1041f5d465e3cbd15ddd66c84bb749d59c4d3cf0a10e0902a7d' 
  AND token = 'pz205xczWT2j0Os+J5FRevU4DuZQNnI66fzl2/FmIk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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