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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3266d83638240da1d137c2f5d71e3ee036c242dd4d3662d2e0b466e597a1b3d1' 
  AND token = 'rn1kBc13Wh946dLRW/Q/IEtca0OOtFez8D1R+ftdpk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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