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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98983b442978543456c8de6a468bb52aa364e5e92827bf64c8a0ff703c9d02ae' 
  AND token = '+Wh9cDsd6d3Vet6DMpaMMdUweY1+wzbEKMVAWVMrGsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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