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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b4778b1fab2b782bb13c64d1c7998800876229a16995bf1056a2095ce508f3' 
  AND token = 'kjI7p49Clm5iKXEh4hM6yblp46vCypJGt3Nw03z9wE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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