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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4909d34cdef258056cbac75dcf4b776c298ff79f9a5a2ee99109d8a5dd5dc2f2' 
  AND token = 'D0QeDAJkO4BvE3Yn1JAszCntveMhRWN366fOduQnsh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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