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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656a71426d7943748582e9534afd7a332da6e91f2ca53fdfa72efcc5d99cdb26' 
  AND token = 'kjnfq3/j1EB2obJKsmMlBrdziBEGTtP1akUV6zhWbP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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