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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6379fde2defbdce068d34047b60e69e3f3cb28a7e2bcdbc9a0b78ef3fdd951f8' 
  AND token = 'SVO+MO4YIVz6l60vkTM3T+6aHa+yRxiMcao523MjkfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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