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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8dd3792b2aa43a381c3ddba9ec56019c584febea9d50ff7b2bc7124092bb6a' 
  AND token = 'q3I+ZeGrCpZaTIdeh8GrvataVhFDtQwPO5oTfTS36fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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