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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba443c7459327cff7a1bfd411bc4b781a7d0e3848602d157fc7ed8d34fd6709c' 
  AND token = 'lTAw68/ydIC2u/c1uCNMc7Ydg9mSR2TOg+NHGK71eLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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