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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714d20213f2ed02e0a54e0eb06119763f33f87ac88f97254cdfa355e864eedd9' 
  AND token = 'nchfPAwFvhk/9vP5C1pVjqa+2br7KkCy2tUV6XAcbQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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