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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03f44636c1a1953c7cbce4c9bd78bcec1974446b2a26821fad5955cb43cee20' 
  AND token = 'Hsp23M+ipdfwb72SFjKpfmgVoKaqL5fQUtQNt2gvLBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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