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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f237bf726e2836287f3122ab9081d0c2d1b94665d04874f43841d74298d68c13' 
  AND token = 'Y7ankJmazGO3oOClfjpNDlPj25axcA+W6/Y7l6iZEWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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