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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d9d5a52540aa20a3a4a4249b7bb21541f5e233520a1a7277aaf31defc91cf7' 
  AND token = 'H8Kmpxp0rovD7R1xGY7D5d4Nc7oa0J5LBaE+jdY18Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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