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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1bca76420836763302a2d644cbff0f9fb669efdaa1c3ee83805f8d8e2376dd' 
  AND token = 'hEhZGQ5Z1FZMkS2vW1GZV3AfsTX34M2smJFJCTpV1hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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