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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0219482b56ed4706ed4469ffab39ae82dec4ce68f2b5a0882fac460dcc64f6' 
  AND token = '4IeA4Me7dmbr2kv/R+/BA8QK0STTh5UL8IXQx/jIRKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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