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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5db485c9f9083c25a54a09bcd156361a0f92fce3108cc8c432b0ac8b8585ae' 
  AND token = '0pSB0PwmoxYkqABnGEaR/GtnwLXphjYHiy5ftVobCXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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