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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b405ea8f0e8d3520d1ca6ef4a1dabf75bc319f5beb4244fd4a56a1360491a6' 
  AND token = 'daPgcXDeXYpBl9ORlempM6sPa5fRNNo5GSB89bZj4y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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