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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c02f98996544ac9cce0e6afbba72004d63cc098094a5d8f1b12c44f9ab2993' 
  AND token = '0wln+6A3cm244hC1Hp6P5ARMwxv51oH0oZBZ8qmfct0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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