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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90c511e7260f2e6c026910500ee9d80b721156e067510de6d0f97007759b00a' 
  AND token = 'L2cfPvFjPZ70Sc4tBmS7Q9bI3R9XZys0cmtC32BtwFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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