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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06d13322b911962d58bed4557e019a5a6ede4438cb367055fb17db786b8ab5d' 
  AND token = 'jwOonINOAvQOChnC0Snrdy3ptfo4JTLVZkeAKhG2wJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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