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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe6db09da5f360eb312e75b974d2e334dc2fe9dfe342a87248e59680715642c' 
  AND token = 'wHVtyTDXEarpoC57MxFZFsMmI4L7SNk3XZG5vLqyhjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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